Spark-plug.



W. J. OGORMAN.

SPARK PLUG.

APPLICATION FILD APR.29| l9l8.

Patented Apr. 29, 1919.

mama m M ATTORNEYS a a wInLIAM J. OGORMAN, or NEW Yong,-

L To albwhomc't may concern Y Be "it known that-*1; WILLIAM -'J. OGoR-'streak-Enos.

mnma eitizen of' thewUnitedStates, and a resident of New York, in thecounty of fNew Yo'rkand State of NewgYork, have in- "vented ertain newand useful Improve nients inspark-Plugs, of which the following is aspecification.

'Myinvention relates to sparl; plugs-providedwitlione or more"artifipi'al gaps. Io catech'in the head thereofand in the circuit ofthe ignition points of the plug such for instance as is described in myprior Patents" N0.-1,228,958, dated June th, 1917, and- No 1,268,049,dated May 28, 1918, the invention "being more'particularly animprovement on the spark plug described in the latter patent.

My invention consists among other things "in providing a simpl andcompact plug havlng the-above general characteristics and i indispensing withall but one terminal post "'-or "otherpr'ojection on: thehead or block thereof, thereby -simplifymgithe construe- "nan-cf theplug.

Other and further objects of the invention will appear from thesubjoineddescription, theinve'ntion consisting in the novel parts and ombinationsof parts hereinafter more I particularly described and then specified inIn the accompanyin'g'drawing:

' Figure l is a vertical-central section taken I through a my improved aspark plug.

the claims.

Fig.2 is'a side "elevation of the same.

Fig. .3 is a frontelevation of the'porcelain or insulating core removedfrom the plug.

;'"-Fig.=4 is a horizontal cross-section take lonitli'e line H'ofFig. 1. .--Referring more particularly to the several figures of thedrawing:

1 -'ndicates the insulating core of the plug provided with a slot 1' cuttherein and car'- rying the lead wires or connections 2, 3' ter minatingin the sparkpoints i, "5 of the normal ignition gap; Said lead Wires 2,3' are held within the insulating core by suitable "mas ngagingtheir upPvided with shoulders 4', 5' adjacent the spark points 4, 5 which areadapted to engage grooves in the insulating core toprevent turning ofthe lead wires within the core as illustrated. 6 indicates themetallicbody or shell of the plug provided with; the for attachment of the.

usual screw thread 7 plug to the engine.

Specification of letters Patent. Application ma Api'i129, 191s. Serialno. 231,331.

Patented Apr. 29,1919.

8 indicates a clamping nut provided-with upper and'lower screw threadedsleeves 9 and 10 adapted to clamp and hold securely in position themetallic fastening plate 11 and the "shell Grespectively. Said metallic6 I fastening plate 11- is provided, preferably/ adjacent the cornersthereof, with ho'l' fl-12' adapted to receive screws for attachment "of;the fastening plate to the rounded head or block 13-which is preferablyconstructed of fiber or hard rubber or other suitable insnla'ting'material."

'The insulating head or block 13 i'spro jvided with chambers '13extending transversely .therethrough, within which the te'i' 'lininatlons or points 114 and 15- of the lead-pie wires 2 and 3respectively extend, the said points 14 and-15 constituting inconjunction with points 16-and17, which also extend within the chambers13', artificial spark gaps located in the circuit of the ignition gap."*Pointlii is formed. at the-end of a return Wire"18 which is entirelyconcealed and is embedded in the head or blockfl3 .of the plug asillustrated. The oppositefend 19 of the return wire 18"extends" jwllwardlyand slightly beyond the surfaceiofg head'13 andis adaptd to enter'a h01e2O in the riietallicfastening platel-I. The point- 17 forms theendof the'main wire ,or tar-{8 mi'nalpost 21 which is held tothe head orblock preferably at the-extreme top portioiil, 1 thereof, as in thecase'of an ordinaryspark} P plug, by a suitable nut and carries abinding screw fdr attachment of a leading in wire (not shown). g

22 indicates a reserve or emergency spark point attached to the end ofthe metallic body or shell '6 of the plug and adapted to I cooperatewith the point 5 to form an ignition gap in the event of the failureofthe main or principal ignition gap to function properly. 23 indicatessuitable frames in which are mounted. wire gauze members" ormembers'niade of a translucentmaterial and which are" fastenedto theheador block 13 and which close the chambers 13 The wire gauze ortranslucent members prevent v ignition of gas outside the plug butperinit the points 14, 16 and 15, 17 to be seen toascertain if they arefunctioning properly. Y

ln ithe 'usual operation of the'plug the circuit is from the leading inWire through the main wire or terminal 0st 21, through the artificialgap at points 1 15 by the lead bers 13 wire 3, across the main ignitiongap through points 5, 4, to the lead wire 2, across the artificial gapat points 14, 16, to the return wire 18 and to ground to wit: themetallic fastening plate 11. In the event that the artificial gap 14;,16 does not function properly, the plug would still operate for thecircuit in this case would be from the lead wire 3, across the gap 5, 22and to the body 6. Obviously and as previously described in my priorpatents, by means of the two artificial gaps in the circuit of thenormal ignition gap the strength of the ignition spark is greatlyincreased.

The head or block 13 is formed of a solid piece, as illustrated, exceptthat the chamand the holes for receiving the main wire 21, the returnwire 18 and the ends of the lead wires 2 and 3, are provided or cuttherein, so that the central portion of he head itself with itsdownwardly extendig projection 30, adapted to fit within the s ot 1 ofthe insulating core 1, forms a barrier to prevent the passage of thespark across from one artificial gap to the other directly and compelsthe passage of the current down to the ignition gap.

It will be obvious from the foregoing description that I have produced asimple and compact form of spark plug provided with artificial gaps aspreviously described and having but one protruding terminal post orother projection on the head or block thereof, which could becomedamaged or out of order and that the concealing of the return wire 18inthe manner descrlbed not only insures'that wire from damage but makesfor an attractive and gracefultype of plug.

What I claim as my invention is 1. In a spark plug, the combination ofan insulating core having conducting wires each terminating respectivelyat its upper end in points for an artificial sparkgap, a main wire orterminal post protruding from the spark plug and connecting with one ofsaid artificial spark gaps and a concealed return wire connecting withthe other of said spark gaps.

2. In a spark plug, insulating core, an insulating block the combinationof an to which said core is secured, conducting wires ex tending throughsaid core and terminating at their upper endsinpoints for artificial,spark gaps, the said block extending down- Gopies of this patent may beobtain'ed tor five cents each, by addressing the wardly between theartificial gaps to form an insulating barrier therebetween.

3. In a spark plug, the combination of an insulating core, an insulatingblock to which said core is secured, conducting wires extending throughsaid core and terminating at their upper ends in points for artificialspark gaps, a main wire or terminal post protruding from the insulatingblock and connecting with one of said a concealed return wire embeddedin said block and connecting with the other of said spark gaps.

4. In a spark plug, the combination of a metallic body, an insulatingcore fitting within said body, an insulating block, a metallic fasteningplate secured to said block, means for detachably joining together saidmetallic body and said fastening plate, conducting wires extendingthrough said core and terminating in chambers in said block to form twoartificial spark gaps, a terminal post on said block connecting with oneof said spark gaps and a return wire embedded in said block andconnecting with the other of said spark gaps and engaging said fasteningplate.

5. In aspark plug, insulating core provided with a slot cut in the upperportion thereof, an insulating block to which said core is secured,conducting wiresextendingthrough said core and terminating at theirupper ends in points for artificial spark gaps and a downwardlyextending projection on said block adapted to fit within the slot insaid insulating core and to form an insulating barrier between theartificial spark gaps.

, 6. In a spark plug, insulating core provided with grooves in the underside of the lower end thereof, conduct- WILLIAM J. OGORMAN.

Witnesses:

F. B. TOWNSEND, EMIL FOERNSLER.

Commissioner of. Patents.

Washington, I). G."

spark gaps and the combination of an i 'ing wires extendinglongitudinally through insulating core to ibo

